A fitted performance baselayer from Under Armour made to handle cold weather. The dual-layer, ColdGear fabric as a soft brushed interior to keep you warm and a smooth, moisture-wicking exterior to keep you dry. Strategic stretch-mesh panels on the back and underarms provide ventilation, and an ergonomic seam design minimizes irritation. This big and tall mock is perfect for workouts or hiking, but can be worn under your clothes anytime you need a bit of extra warmth. Fitted for a more streamlined fit ColdGear dual-layer fabric with a warm, brushed interior and smooth, quick-dry exterior Four-way stretch for comfort and mobility Stretch-mesh back and underarm panels for ventilation Ergonomic seam design to minimize abrasion 87% polyester, 13% elastane Machine wash Imported Buyers Note: Item runs small. Consider sizing up or please read below and follow our Under Armour-specific size guide for the best fit.